I think the simplest explanation is paint is made from oils and oil floats on water. When you dip an item it the paint surface tension and the water and paint not wanting to mix cause the surface paint to stick to the item and as it goes under it “drags” the oils paints across the water and down the initial dip point. Painting the object. It might be easier to imagine the paint as a sheet of plastic wrap on top of a tub of water. Wherever you push down on the plastic the rest will follow. That’s basically the exact same thing but both are liquid but oil is hydrophobic.
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